NASCAR star Kyle Busch experienced shortness of breath, felt he was overheating and was coughing up blood the day before his death, according to a 911 call obtained Friday by CBS News.

It’s a solemn day as tens of thousands of NASCAR fans are trekking to Charlotte Motor Speedway to remember Kyle Busch at the first race after since his sudden death.

Tributes to Busch were prominent throughout the event, including his No. 8 and signature emblazoned on the frontstretch grass, a highway billboard near the main entrance, and black No. 8 decals affixe...